Appreciate the response!

But there is plenty of space available.  About 250 free GBs. My test VM is about 40gb.

On Tue, Apr 16, 2019, 1:12 AM Eyal Shenitzky <eshenitz@redhat.com> wrote:

Hi Wesley,

Currently, there is no direct way to change disks allocation policy (thin-provision <-> preallocation).

In your case, it sounds like your ISCSI storage is running out of space, changing disk from thin-provisioned to preallocation will consume more space on the storage, thin-provision is more space effective but impact the performance.

On Mon, Apr 15, 2019 at 8:35 PM Wesley Stewart <wstewart3@gmail.com> wrote:

I am currently running a ZFS server (Running RaidZ2) and I have been experimenting with NFS and shares to host my guests.  I am currently running oVirt 4.2.8 and using a RaidZ2 NFS mount for the guests.

ZFS definitely is definitely pretty awful (At least in my experience so far) for hosting VMs.

ZFS is definitely pretty awful at keeping your data _unsafe_ : )

Add a piece of the SSD's as mirrored SLOG and be both safe as fast. My two cents.

/K

I believe this is due to the synchronous writes being performed.  However, I think running an iSCSI target with Synchronization disabled over a 10Gb connection might do the trick. (I have a couple of mirroed SSD drives for performance if I need it, but the RaidZ2 crawls for disk speed).

When I tried to migrate a thin provisioned guest to iSCSI, I keep getting an "Out of disk space error" which I am pretty sure is due to the block style storage on the iSCSI target.  Is there a way to switch from Thin to Preallocated?  Or is my best bet to try and take a snapshot and clone this into a pre-allocated disk?

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--

Regards,

Eyal Shenitzky

On Mon, Apr 15, 2019 at 8:35 PM Wesley Stewart <wstewart3@gmail.com> wrote:

I am currently running a ZFS server (Running RaidZ2) and I have been experimenting with NFS and shares to host my guests.  I am currently running oVirt 4.2.8 and using a RaidZ2 NFS mount for the guests.

ZFS definitely is definitely pretty awful (At least in my experience so far) for hosting VMs.  I believe this is due to the synchronous writes being performed.  However, I think running an iSCSI target with Synchronization disabled over a 10Gb connection might do the trick. (I have a couple of mirroed SSD drives for performance if I need it, but the RaidZ2 crawls for disk speed).

When I tried to migrate a thin provisioned guest to iSCSI, I keep getting an "Out of disk space error" which I am pretty sure is due to the block style storage on the iSCSI target.  Is there a way to switch from Thin to Preallocated?  Or is my best bet to try and take a snapshot and clone this into a pre-allocated disk?

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--

Regards,

Eyal Shenitzky

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